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Stranded or solid THHN

wantacoe

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Apr 28, 2015
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650
Location
Sycamore, il
I have decided to use thhn and conduit in my pole building. Is there a preference to use stranded or solid?
 
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wyliesdiesels

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Aug 14, 2012
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19,983
Location
Modesto, CA
Is this for 20a 120v circuits or?

If you use it on 120v outlets, i would use sta-kons for connection to the terminals
 

Jim greengo

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Sep 3, 2018
Messages
7,415
Location
Behind my house
Stranded is easier to pull,solid holds its shape better when making up the panel.
I'd normally go with solid,its usually cheaper also.
 

Stuart in MN

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Sep 8, 2005
Messages
22,994
Location
Minneapolis
For #14 or #12 (depending on the ampacity of your circuits) I think it's more personal preference than anything.
 

Norcal

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Mar 16, 2008
Messages
13,752
Solid is only a option with 10,12,14, AWG, 8 & larger is stranded only.
 

7635tools

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Joined
Feb 19, 2015
Messages
87
Location
Southeast Wisconsin
I would use stranded. Solid wire *****. Solid does form better for trimming the panel but trying to add wires in the conduit down the road is a pain with solid. Stranded wire is easier to pack in the boxes when trimming outlets and switches. Me personally, I never use solid wire.
 

Bert_

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Dec 24, 2016
Messages
9,694
Location
NW Iowa
I hardly ever pull stranded in #12 or #14 for switches and outlets. Almost always solid.

Wire to motors or in control cabinets I'll pull stranded in any size.
 

sberry

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Jun 18, 2005
Messages
35,747
Location
Brethren, Michigan
I guess it's personel, I like stranded. It doesn't tend to loosen the screws on devices pushing then in boxes. Doesn't give permanent bends so to speak when doing complicated pulls. I don't even stock solid.
 
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sberry

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Jun 18, 2005
Messages
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Location
Brethren, Michigan
I never have an issue with screws. I strip a little long, left twist and can wrap enough I can pinch the dead eND around and pull on it whill tightening the screw. I have worked on a lot of my old own work, never find them loose.
I do use a crimp connector on ground wires to steel boxes most of the time.
 
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Showkey

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Aug 9, 2014
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Location
Wausau WI
For the DIY guy the stranded ends Terminal are the wild card........poor fit, poor crimps.
 

theoldwizard1

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Joined
Feb 22, 2011
Messages
43,076
Location
SE MI
If you use stranded (and I would) spend the extra money and buy "side clamp" duplex outlets. So much easier and faster to terminate !
 

sberry

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Jun 18, 2005
Messages
35,747
Location
Brethren, Michigan
I keep a couple back wire around for old work. I was in my truck the other day and wanted a 49 cent one and finally all I could find was a better one. Ha But they can save where old **** is small enough already.
 

sberry

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Jun 18, 2005
Messages
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Brethren, Michigan
I done it enough can make a good connection screw and sidewire. Using 4x4 boxes for power beyond with pigtails makes for good connections. I am a bit of a fussy **** with wire nuts with 3 or more, make them long, twist the nut on some, back off, trim and screw on really tight.
 

sberry

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Jun 18, 2005
Messages
35,747
Location
Brethren, Michigan
Strip a fat inch long, twist hard left, can make a generous u around the screw and can kind of tension it around the screw as it binds down. On solid I test run the push in to the box and hyper tighten it with solid at the last second.
 

sparky 1971

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Joined
Oct 9, 2018
Messages
7,964
Location
Central Iowa
Yep. It's all personal preference. Solid is easier to push and make up. Stranded is easier to pull. I usually use stranded, but only because I don't normally have any help.
 
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